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A vapor cone (also known as a Mach diamond, [1] shock collar, or shock egg) is a visible cloud of condensed water that can sometimes form around an object moving at high speed through moist air, such as an aircraft flying at transonic speeds. When the localized air pressure around the object drops, so does the air temperature.
The time taken for the vapor to cool enough to condense accounts for the contrail forming some distance behind the aircraft. At high altitudes, supercooled water vapor requires a trigger to encourage deposition or condensation. The exhaust particles in the aircraft's exhaust act as this trigger, causing the trapped vapor to condense rapidly.
Lift-induced vortices behind a jet aircraft are evidenced by smoke on a runway in an experiment by the German Aerospace Center (DLR) An audio recording of lift-induced vortices heard shortly after an airliner flew over the recorder. Wingtip vortices are circular patterns of rotating air left behind a wing as it generates lift.
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In one video geolocated by NBC News near the village of Kuzhenkino in Tver oblast, Russia, what looks like a plane can be seen spiraling down through clouds, trailing smoke behind it.
The smoke system uses 10 imperial gallons (45 L) per minute; therefore each plane can trail smoke for a total of seven minutes: – five minutes of white smoke, a minute of blue and a minute of red. [57] In 2021, the MoD asked the civil sector to help develop an environmentally friendly smoke system for the team's aircraft.
Sam Mohawk, a Boeing employee of 13 years, claimed on "60 Minutes" that some factory workers took flawed airplane parts from storage and installed them on airplanes in order to keep production ...
Skywriting is the process of using one or more small aircraft, able to expel special smoke during flight, to fly in certain patterns that create writing readable from the ground. These messages can be advertisements , general messages of celebration or goodwill, personal messages such as a marriage proposals and birthday wishes, or acts of protest.